LifeMale octopuses have a favourite arm that they mostly use for sex The third right arm of male octopuses has a specialised role in mating, and the creatures take extra care to avoid damaging it or losing it to a predator News
LifeAncient 'weirdo' reptile graduated from 4 legs to 2 in adolescenceSonselasuchus cedrus, discovered in fossils from Arizona, was a crocodile relative from the Triassic period that grew into an ostrich-like adult News